"Blithe Spirit" by Noël Coward

Novelist Charles Condomine invites a medium, Madam Arcati, to his house, hoping to gather some material for his next book. During the séance, however, the eccentric guest conjures up a spirit which turns out to be Charles' deceased wife Elvira. And she has a plan: To disrupt his second marriage with Ruth who cannot see or hear the ghost...